초록 ▼

A long life railroad track and tie arrangement and method of making same. A wooden railroad tie is impregnated and covered with a thin layer of polypropylene which serves to protect the tie both from the weather and from mechanical abuse. The tie is apertured to receive rail mounting hardware. A bot

A long life railroad track and tie arrangement and method of making same. A wooden railroad tie is impregnated and covered with a thin layer of polypropylene which serves to protect the tie both from the weather and from mechanical abuse. The tie is apertured to receive rail mounting hardware. A bottom plate is secured to the underside of the tie and carries threaded fastening means mating the tie apertures. A top plate overlies the tie, carries a channel for receiving the rail, and is apertured to mate the tie apertures. A pair of apertured clips have extended arms overlying the prepositioned rail. Bolts are passed through the clips, the top plate, the tie and into the fasteners in the bottom plate to reliably secure the rail to the tie. In addition to its application in conventional track laying or track repairing situations, the invention allows manufacture of track in transportable prefabricated track and tie sections, which may be positioned and joined on site by simply welding adjacent rails.

대표청구항 ▼

A method of extending the life of wooden railroad ties comprising the steps of providing a mold having a cavity for receiving the tie, supporting the tie within the cavity and closing the cavity with the respective planar surfaces of the tie spaced from associated walls of the cavity, providing a so

A method of extending the life of wooden railroad ties comprising the steps of providing a mold having a cavity for receiving the tie, supporting the tie within the cavity and closing the cavity with the respective planar surfaces of the tie spaced from associated walls of the cavity, providing a source of polypropylene at a temperature sufficiently high to allow said polypropylene to flow, injecting said polypropylene into the cavity under pressure so as to cause said polypropylene to fill any voids and cracks in the tie to form a thin protective layer on all planar surfaces of the tie, the thickness of the protective layer being defined by the spacing between the planar surfaces of the tie and the respective walls of the cavity, cooling the polypropylene to cure the protective coating, and removing the treated tie from the mold.